Monojet+MET events with large width
Hello,
I am generating monojet+MET events using the syntax p p > j vl vl where I have an s-channel propagator which can have large width (0.1M, say). I am using default bwcutoff (i.e. 15).
How does MG5 compute cross section in such case ? I guess it gives both on and off shell contributions with this syntax. If I use a smaller bwcutoff (say 5), then does it give more contribution near the resonant mass for a large width resonance ?
If it uses narrow-width approximation for the calculation, then the output is reliable for how large a width (i.e. where one should stop in terms of width for reliable number)?
Btw, I am not worried about any interference.
Thanks in advance.
Saurabh Niyogi
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